Having one or more dormers; constructed or modified to include dormer windows.
From dormer (a window projecting from a roof) plus -ed suffix indicating possession or modification. Dormer itself comes from Old French dormir (to sleep), as these rooms were historically sleeping quarters.
A dormered house tells you instantly about its architecture—those cute little windows poking out of the roof are basically the house saying 'wake up, there's more room up here!'
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